The present investigation reports the results of the effects of mercury on seed germination, coleoptile growth and root elongation of four vegetables. The effects of seven serial doses of mercury (0, 0.1, 0.2, 0.4, 0.8, 1.6 and 3.2 mM) on four vegetable crops were studies. Seeds were surface sterilized and washed with distilled water. The seeds were germinated in Petri dishes with double layer of filter paper soaked in distilled water (control) and 0.1-3.2 mM HgCl2 solutions. The seeds were set under a photoperiod of 12 h and 32±1/25±1°C day/night temperature. The root and shoot length of seedling were measured and the germination percentage was recorded after 96 h. The different concentration of Hg2+ showed reduction in coleoptile growth and root elongation with increase in concentration of Hg2+. All the treated species were significantly inhibited when the Hg2+ concentration up to 0.8 mM. Brassica oleracea was the most sensitive species to mercury among the four test species, B. campestris was the most resist species to mercury pollution. These four vegetables were more sensitive to mercury stress in coleoptile growth and root elongation than seed germination.